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Consolidated Statement of Shareholders' Equity - 9 months ended Oct. 01, 2017 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance, Shares at Dec. 31, 2016 85,939,000 85,939,000      
Beginning Balance at Dec. 31, 2016 $ 962,599 $ 172 $ 375,030 $ 643,825 $ (56,428)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock under stock plans, shares   1,732,000      
Stockholders' Equity, Period Increase (Decrease)   $ 3      
Issuance of common stock under stock plans 44,750   44,747    
Stock Repurchased During Period, Shares   1,084,000      
Stock repurchased during period, Value 99,347 $ 2   99,345  
Stock-based compensation expense 23,355   23,355    
Payment of dividends (21,236)     (21,236)  
Net income 204,075     204,075  
Net unrealized gain (loss) on cash flow hedges, net of tax of ($5) (16)       (16)
Reclassification of net realized loss on cash flow hedges (21)       (21)
Net unrealized gain (loss) on available-for-sale investments, net of tax of $191 1,237       1,237
Reclassification of net realized (gain) loss on the sale of available-for-sale investments (370)       (370)
Foreign currency translation adjustment, net of tax of $0 $ 18,497       18,497
Ending Balance, Shares at Oct. 01, 2017 86,587,000 86,587,000      
Ending Balance at Oct. 01, 2017 $ 1,133,523 $ 173 $ 443,132 $ 727,319 $ (37,101)